Asshole at work

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There's this guy at work who's being a dick.

He was walking by the hand washing basin and said goodbye to everybody, individually, except me. Then he went over to some new guy and bragged about excluding me, then made a sound effect like he was punching something, though I can't possibly imagine what that thing would be.

I'm the bosses son, so this puts me in a bit of a pickle. I'm not sure if I should be a dick back, or pretend it never happened. If I ignore it, I look weak, but this particular situation blows over quickly, and vice versa if I confront him.

For the record, I wasn't a dick to him at all. I'm really confused as to why he would do this, but it's not the first time hes just decided to be a faggot for no reason. He's just unstable. And although I have the power to hire and fire, we need someone running his cell right now, and this isn't the type of job where you can just pick a random person to do what he does.